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N. PETERS. PHOTO L THOGRA 5mm @anni Were-awww ARTHUR M. ALLEN, OF'NEW YORK, N. Y. e

Leners Patent No. 89,457, dad'kpfil 27,1869.

IMPRVEMENT IN REVBRSING-G-EAR POR STEAM-ENGINE.

To all whom 'it ma/y concern:

Be it known that I, ARTHUR M. ALLEN, of the city, county, and State of New York, have invented a new and useful Improvement in the Reversing-Gear for Steam-Engines; and Ido hereby declare the following to be a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawing, forming part of this specification, in which drawing- Figure l represents a longitudinal section of this invention.

Figure 2 is aplan or top view of thesame.

Figure 3 is a detached section of the reversing-disk.

Similar letters indicate corresponding parts.

This invention consists in the arrangement of a reversing-disk, or plate, provided withffour steam-ports and one or more exhaust-ports, and placed between the slide-valve and the bottom of the steam-chest, two of the steam-ports in the reversing-disk, or plate, passing square down, while the other two are provided with reversing-channels, in such amanner, that when the disk, or plate is brought in such a position'that the square or forward ports correspond with the steamports in the steam-chest, the engine runs forward, but by moving the disk, or plate, so as'to bring the reversing-ports over the steam-ports of .the steam-chest, the engine'is reversed.

In the example which I have represented in the drawing, the letter A represents a disk, made of castiron, or any-other suitable material, and provided with a. round central hole, to admit the nipple B, which is intended to be fastened in the bottom of the steamehest, and which is perforated with a flat hole,a, to correspond to the exhaust-port of the steam-chest, as indicated in fig. 1 of the drawing.

The disk A is provided with four ports, b b', c c', which are situated opposite to each other, and at such a distance from the centre, that by turning the disk, either the ports b b' or the port-s c c can be brought to correspond with the steamports al d', of the steamchest.

The face of the disk forms the seat for the slidevalve, and the ports b b pass square down through laid disk, while the ports c c' are provided with reted through the port c passes into the steam-port cl,`

and the' steam admitted through the port c passes into the steam-port d, and the engine is reversed.

It will he observed that the disk A has to receive a quarter turn, if the engine is to be reversed. This -motion I propose to impart to the disk by a rod, which slides in the sides of the steam-chest, and which is provided with two pins, that .stiaddle an arm, f, ex-

tending from the disk, as indicated in ig.2 of the drawing; but it is obvious that the required motion can be imparted to said disk by various di'erent means, and I do not wish 'to confine myself, in this respect, to any particular mechanism.

Instead of using a disk, as above described, I can also use a block or plate, provided with two forward and two reversing-ports, and so arranged that it can be moved in a rectilinear direction.` In this case, the exhaust-port in the plate must either be large enough to allow of the motion of the same without covering up the exhaust-port in the bottom of the steam-ehest, or two exhaust-ports must be -made in said plate, one to act with forward and the other with the reversingports.`

Having thus described my invention,

What I claim as new, and desire to'secure by Let ters Patent, is-

1. The reversing-block, or disk, provided with two forward and two reversing-ports, and with one or more exhaust-ports, arranged substantially in the manner set forth.

2. The reversing-disk A, provided with forward portsr 

